Typewriting machine



J. H. BARR.

TYPEWRITING MACHINE.

APPLICATION FILED AUG.20.1920.

l ,4 1 3,3 1 2. Patfinted p 18, 1922.

3 SHhEIS-SHEET I.

INVENTDR WITNESSES JL WPM a} /y Hi5 ATTURNEY J; H. BARR.

TYPEWRITING MACHINE.

APPLICATION man AUG.20. 1920. 7 1,41 3,312. Pa'wnted pr. 18, 1922. I s SHtETS-SHEET 2. v

WITNEESEE INVENTUR p/K f L,

' M ffls ATTURNEY J. H. BARR.

TYPEWRITING MACHINE.

Patented Apr. 18,- 1922.

0 2 9 0 2 & u A D E L H N 0 H A c U P DI A 3 SHhETS-SHEET 3.

-WITNE55EE J W D STATS r T F. c

JOBIN H. BARR, OF NEW YORK, N. Y., ASSIGNOR TO REMINGTON TYPEWRI'I'ER COM- PANY, OF ILION, NEW YORK, 1A

CORPORATION or NEW YORK.

TYPEWRITING MACHINE.

York, have invented certain new and useful Improvements in Typewriting Machines, of which the following is a specification.

My invention relates to ribbon mechanism for typewriting machines, and its object is to provide new and improved means for varying the vibratory movement of the ribbon so that different widthwise portions or color fields may be employed at will, and also for dispensing entirely-with the use of the ribbon when it may be desired to make stencil or mimeograph sheets, or the like. My present invention is an improvement on the prior invention disclosed in my Patent No. 1,153,668 granted September 14, 1915.

Tothe above andother ends which will hereinafter appear my invention consists in the features of construction, combinations of devices, and arrangements of parts hereinafter described and particularly pointed out in the claims.

In the accompanying drawings,

Figure 1 is a front to rear vertical sectional view of a typewriting machine embodying my present invention, parts of the machine being omitted and parts broken away. I 4

Figures 2 and 3 are perspective views of the ribbon field changing mechanism.

Figures 4, 5 and 6 are diagrammatic views.

Figure 7 is a fragmentary front elevation of the ribbon vibrator or carrier and its guide. 2

Figure 8 is a horizontal sectional View taken on a plane indicated by the dotted line 0cain Figure 7 and looking downward.

Figures 9 and 10 are vertical sectional views illustrating different adjustments of the ribbon fieldchanging mechanism, drawn to a .somewhat larger scale than the corresponding parts in Figure 1.

Figure 11 is a vertical sectional view on an enlarged scale, taken slightly forward of the plane indicated by the dotted line g g in Figure 1 and looking in the direction of the arrow at said line.

Figures 12 and 13 are views corresponding to Figure 11 but showing different ad-, justments of the parts or stop devices.

As appears from Fig. 1, the main frame of Specification of Letterg latent. Patented Apr, 18, 1922 Application filed August 20,

1920. Serial No. 404,721.

the machine comprises side plates 1, a cross platel2 connecting the side plates at the rear, a U-shaped frame 3 enclosing the keyboard, and top plate sections 4, the side plates 1 terminating at the front in inwardly bent front portions 5. Above the main frame is arranged a platen 6 diagrammatically illus-' tra'ted, mounted on a carriage, not shown, that is adapted for movement from side to side of the machine under the control of suitable mechanism. Printing key levers 7 are provided with keys 8 and are fulcrumed on rods 9 mounted on a sub-frame 10 detachably secured to the main frame. The key levers are provided each with a slot 11 engaged by a projection or pin 12 on an angular lever 13 pivoted at 14 on said sub-frame. angular lever is connected by a link 15 with a bell crank 16 pivoted at 17 on a support'18. Said bell crank is provided with a restoring spring 19 and its longer arm extending horizontally rearward carries a pin 20 engaging in a cam slot 21 in a' type bar 22 pivoted on a fulcrum wire 23 secured to an upright type bar segment 24 formed with radial slots 25 in which the type bars are received and guided. Normally the type bars extend horizontally forward from their pivots and rest against a pad 26 mounted on the support Said 18. The type bar segment 24 and the support 18 are suitably connected together and are adapted to be shifted to change case preferably by mechanism of the character disclosed in the pending application of John H Barr and Edwin E. Barney, Serial No. 403,780 filed August 16, 1920. The type bars when their associate keys are depressed will be caused to co-operate with the front or printing face of the platen 6. Such features of the type bar mechanism illustrated herein as are novel are not. claimed in the present application as they are not per se part of the ribbon vibrating and controlling mechanism to which this application primarily relates.

Each top plate section 4 is provided with a cup or depression 27 which accommodates a ribbon spool 28. Said ribbon spool 1s con nected with an upright shaft 29 which at lts lower endcarries a bevel pinion 30 that s adapted to mesh with a pinion 31 on a hor1- zontal shaft 32 arranged within the base and another shaft 33 by pawl and ratchet devices, not shown, said shaft 33 being arranged below and parallel with the shaft 32 and supported on brackets 3 secured by screws 35 to the sub-frame 10. Mounted on the shaft 33 near its ends are crank arms or plates 36 each provided with a collar 37 that receives a cross pin 38 passing through the shaft-33 and fixedly securing the crank arms 36 thereto. The crank arms extend upward and are curved forward at their upper ends, said ends being connected by a channel or cross bar 39 which is arranged in inclined position and is adapted to be acted upon by noses or contact portions 7 on the printing key levers 7. Each time one of the printing key levers is actuated it not only causes a printing operation of the con nected type bar 22 but also actuates the cross bar 39 which serves as a universal bar for the ribbon vibrating mechanism, the righthand crank arm 36 being provided with a rearward and upward extension 36 formed with a slot 40 that connects with said vibrating mechanism as hereinafter appears. The ribbon feeding mechanism partly disclosed in the present application is not claimed per se by me since it is the invention of Edwin E. Barney.

lVound on the ribbon spools 28 is a ribbon 41 which may be divided longitudinally into fields a and 7) having difierent colors or characteristics. The ribbon passes from the spools through guide slots 42 formed in the cups 27 and midway between the spools is threaded through a ribbon guiding device or vibrator. indicated as a whole by the numeral The vibrator is vertically arranged and comprises a body portion 4A, a depending stem 4:5 and two pairs of upwardly extending fingers 46 and 47, the inner pair of fingers being spaced apart from the outer pair to provide slots or guiding openings 18. The outer pair of fingers are offset forward and thence incline upward and rearward terminating in horizontal forwardly extending ledges 5T9. The ribbon is threaded through the vibrator by being passed inward over the outer fingers 47 and below the ledges 49 and thence behind the inner fingers 46. The ledges 4C9 serve in effect as hooks which prevent the ribbon from accidentally being displaced upward, while the bottoms of the slots 48 prevent the ribbon from dropping downward. The side port-ions of the body 44: of the vibrator are inclined forward in parallelism to provide guide walls 50 which cooperate with contact faces 51 formed on the inwardly turned arms 52 of an til-shaped guide member 53. The lower arms of said guide member are offset or bent rearward behind the type bar.

segment 2 1- andreceive screws 54 by which the guide member is secured to a channel bar 55. Said channel bar extendsfrom side to side of the machine and is fixed by screws 56 to ears 1 extending upward from the side plates 1. The upper or guiding portion of the guide member 53 is about in a plane of the type bar segment above which said side member extends. Secured to the front face of said segment by screws 57 is a type guide 58 which assists to guide the vibrator at its front side; The vibrator is prevented from dropping back towards the rear by the cross bar of the member 53.- The downward position is controlled by the rocking frame 91 for normally maintaining the vibrator so that the printing portion of the ribbon controlled byit is below the printing line of the platen. as will be understood from Fig. 1 wherein the printing point is indicated by the character 70.

The lower end of the stem 45 of the vibrator is bifurcated to receive the forward end of a crank arm 59 which is pivotally connected with the vibrator by a cross pin 60. The crank arm at its rear end is formed with a hub secured by a cross pin 61 to a rock shaft 62 at its left-hand end portion. Said rock shaft is supported on hanger arms depending from the channel bar 55. There are three of these hanger arms. the left-hand one 62 being short and the right-hand and central hanger arms 63 and 64: being somewhat longer. These hanger arms are provided at their upper ends with horizontally bent ears which are secured by screws 65 to the under face of the channel bar. Said channel bar is somewhat like an inverted U in cross section and houses the upper end portions of the hanger arms. These are curved or somewhat offset rearward so that the rock shaft 62 is about in line with the rear wall of the channel bar. The right- 'hand end portion of the rock shaft (32 has pinned to it a collar 66 which prevents endwise displacement towards the right, although permitting rotary movements of the rock shaft, the hub of the crank arm 59 preventing endwise leftward displacement. Depending from the rock shaft 62 somewhat to the right of its middle is a crank arm 67, said crank arm having a hub 68 which is secured by pins 69 to said rock shaft. The crankarm is provided with oppositely extending lateral pins 70 and 71, the pin 70 being somewhat nearer the axis of the shaft 62 than is pin 71 so that the movement of the pin 70 is somewhat less than that of the pin 71 for the same extent of turning movement of the shaft 62. Engaging loosely with the pin 70 is the upper hooked end 7 2 of an armor actuator 73 terminating below in a horlzontally disposed cross portion 74 having at its ends forwardly bent ears 7 5 that bear loosely on and are supported by a rock shaft 76. Similarly the pin 71 is loosely embraced by the upper forked end 77 of an actuator 78 terminating at its lower enough to afford a passageway for the acend in a cross portion 79 provided with forwardly bent ears 80 perforated to bear loosely on the rock shaft 76. The actuator 78 is somewhat shorter than the actuator 73 and its cross portion 79 has less spread than the cross portion 74so that the ears 80 are loosely confined between the ears 75. A collar 81 secured to the rock shaft 76 between the ears 80 by a pin 82 prevents the two actuators from being displaced endwise of the rock shaft 76 without impeding relative rotary movementbetween the actuators and the rockshaft. The rock'shaft 76, as will be clearly understood from Figs. 1 and 2, is connected to the rock shaft 33 by a train of devices comprising a crank arm 83 which is mounted on said rock shaft 76 inside or to the left of the hanger arm 63 and has a hub 84 which receives a pin 85 passing through the rock shaft 76 and fixing the crank arm thereto. Said crank arm 83 is inclined outward and downward carrying at its lower end a laterally headed pin 86 which is received in the slot 40 of the crank arm 34. The two crank arms 34* and 83 cooperate through their pin and slot connection 40, 86

- to transmit movement at each printing operation from the rock shaft 33 to the rock shaft 76, the two rock shafts turning oppositely; that is the rock shaft 33 turns counter-clockwise while the rock shaft 76 turns clockwise when a keylever is depressed.

The movement of the rock shaft 76- is adapted to be transmitted selectively or at will to the actuators by devices next to be described. A short crank arm 87 has its hub 88 secured by a pin 89 to the left-hand end of the rock shaft 76 inside the hanger arm or bracket 64. Said crank arm extends upward and supports the left-hand end of a cross rod 90. The right-hand end-- of said cross rod is supported by a crank arm which preferably is an upward extension 83 of the crank arm 83, the extension 83 corresponding to the crank arm 87. The cross rod 90 serves to actuate and partlyto guide a rocking frame or oscillator designated as a whole by thereference numeral 91 and best shown in Figs. 1, 2 and 3. The rocking frame is shaped like an inverted U having a body portion 92 and downwardly extending parallel and side portions or arms 93. The lower ends of the side portions or arms 93 are perforated and fit loosely over the rock shaft 76. The arms 93 are likewise formed with elongated slots 94 through which the rod 90 passes. The body or horizontal portion 92 of the rocking frame is cut out irregularly, providing two slotted portions 95 and 96 connected by a narrow slotway 97 which is just widetuators 73 and 78. The rocking frame is adapted to be moved endwise to different set positions along the guide rods or shafts 90 and 76 by means presently to be described so as to bring the actuators at will into and I outof co-operation with the narrowslotway 97. When either actuator is .within the control of the narrow slotway it is operatively connected to the rocking frame which serves as an actuating lever member for actuating said actuators and vibrating the ribbon vibrator. The hooked upper ends of the two actuators remain always engaged with their associate pins and 71 sothat both actuators are constantly connected to the ribbon vibrator, their operation depending on whether or not they are engaged i the slotway 97 of the rockin frame. The operation of the parts in this connection will be explained subsequently more at length. A finger 63 extending laterally inward from the arm 63 serves as a stop to limit forward movement of the rocking frame 91 when it receives actuation from the printing keys to the train of devices comprising the universal bar 39, the crank arms 34: and 83 and rod 90, which rod when swung forward acts through the slots- 94 to communicate a corresponding swinging movement to the rocking frame, which will turn on the axis of the shaft 76 as a center, said rocking frame having a uniform vibratory inovement under actuation of the printing keys.

In order to set the rocking frame or ac tuating lever member 91 in selected positions relative to the actuators 73 and 78, devices are provided which co-operate with an extension 93 rearwardly projecting from the right-hand side arm 93. Said devices, as will best be understood from Figs. 1, 2 and 3, comprise a horizontally disposed arm 98 formed with a slot 99 which receives the shouldered portion of a headed pin 100 on which said arm bears. The shank of the pin, as clearly shown in Fig. 9, is received in an opening in the enlarged bearing end 101 of a bracket 102, said pin being secured i-n place on said bracket by a set screw 103 which abuts against a flattened part of the shank of the pin 100. The bracket or bearing 102 extends upward and rightward from its bearin end 101 and said bracket terminates in an enlarged angular head having a horizontal portion 104 and a vertical portion 105 at right angles thereto, the vertical portion receiving headed screws 106 by which the bracket 102 is secured to the inner face of the righthand side plate'l. The arm 98 is formed with a vertical slot 107 having a somewhat flaring mouth at its upper end to facilitate assembling, this slot 107 receiving and co-operating with the extension 93 on the rocking frame 91; Above the bearing slot spring 111 which is properly shaped to enter said notches. The detent spring is secured by screws 112 to the part 104 of the bracket 102. A washer 113 is interposed between the heads of the screws and the righthand end portion of the detent spring, this portion being bent rearward at right angles to the spring arm portion thereof. The arm 98 is pivotally connected at its right-hand end at 114 to a crank arm 115 depending.

from and secured to the rear end portion of a forwardly extending rock shaft 116, the hub of the crank arm' 115 being secured to said rock shaft by a set screw 115. The rear end of the rock shaft bears in the bracket 102 and its forward end portion extends through and bears in the right-hand frame part The rock shaft 116 is key controlled, its front end forward of the frame plate carrying a downwardly extending finger piece or key 117 for variably setting the field changing mechanism. A pointer is secured behind the key or handle 117 and extends upward from the rock shaft with which said pointer 113 is adapted to turn. Ahe pointer cooperates with an indicating device in the form of a triangular plate 119 secured at the front of the righthand frame part 5 and behind the pointer 118. The plate 119 is provided with openings 120, 121 and 122 behind which may be arranged letters, colors or other indicia with which the pointer may co-operate to indicate the color field in use or that the ribbon mechanism is disconnected so that stenciling may be done, etc. 1n the present instance when the ointer 118 is opposite the opening 121, as in Fig. 2, the parts are set for printing from the upper ribbon field a, when the pointer is opposite the opening 122, the parts are set for printing from the lower ribbon field I), while when the pointer is opposite the opening or device 120 the parts are set for stenciling or mimeograph work, the ribbon vibrating mechanism having been disconnected so that it will not be operated by the printing keys, as is later to be explained. It will be noted that the channel bar carries the ribbon vibrator guide member 53 and ribbon vibrator 43 and also the ribbon field changing devices at the back so that when the screws 56 are unscrewed and said channel bar is detached the ribbon vibrating mechanism will be detached with it as a unit down to the arm 98 of the field changing mechanism and the arm 36 of .the ribbon vibrating mechanism. In other words substantially all of the devices shown -in Fig. 2, except the arm 36 and the shaft 116 and the parts connected to said shaft at its forward end, are, together with the channel bar 55, detachable and attachable as a unit.

Associated with the rock shaft 116 are novel stop devices for positively arresting the field changing mechanism in predetermined positions. Said devices are shown in Figs. 1, 2 and 11-13 and comprise a member designated as a Whole by the numeral 123 pivoted on a shoulder screw 124 at the rear face of the frame part 5. The member 123 comprises a body portion 125 and a leftwa'rdly extending handle or finger piece 126. The body portion is formed with an irregularly shaped slot 127 through which the shaft 116 passes. Said slot is provided with faces'128, 129 and 130 at one side of its open mouth and at the opposite side with the face 131. These faces are adapted to co-operate with the faces 132 and 133 of a projection 13% on a' collar 135 secured by a set screw 136 to the rock shaft 116 behind the member 123. The projection 13 1 is generally triangular in shape, extending forward from the body of the collar 135 and the two stop faces 132 and 133 are disposed at right angles to each other, being connected by a curved face concentric with the axis of the shaft 116.

in operation, assuming the parts to be set and related as in Figs. 1, 2, 5 and 11, the depression of one of the printing keys 8 will cause the nose 7 on the associate lever 7 to act against the bar 39, rocking the universal bar frame comprising bar 39 and arms 36,

at the same time that the train of connections to the type bar 22 is operated. The actuation of the universal bar 39 will result in its motion being transmitted through the 34 and 33 to the rock shaft 76 and thence to the rocking rod 90, said red acting against the forward sides of-the slots 9% to swing the rocking frame 91 forward. At this time the rocking frame is set so that the actuator 7 8 is engaged in the narrow slotway 97, the result being that the motion of the rocking frame 91 is transmitted to the actuator 78, which will also be swung forward, acting through its forked upper end 7 7 and the pin 71 to swing the crank arm 67 forward and turn the rock shaft 62 and its bearings. This turning movement of the rock shaft 62 will be transmitted to the lever arm 59 which will be swung upward, lifting the vibrator 13 and the printing portion of the ribbon controlled by it. The relation-. ship of the parts is such that when the train of vibrator actuating devices is arrested by the engaging of the front edge of the righthand arm 93 of the rocking frame with the stop finger 63 the vibrator will have been lifted far enough to present the upper field a of the ribbon 41 to the printing poirlt.

with a contact nose or stop face 93 for contacting with the stop 63", "as clearly illustrated in Fig. 9. The actuatedposition of the: arts at this time is illustrated in Fig. 9. he parts are so timed that the ribbon type before the" latter operatively contacts with the platen. During the actuation of the ribbon vibrator by the actuator 78, the actuator 73 will move idly, swinging forward in the slot or opening 95 by reason of the connection of the fork 72 withfthe pin 70. After the printing operation the trains of devices for actuating the type bar and ribbon vibrator will be restored to normal position, suitable springs being provided for restoring the ribbon vibrator devices if found desirable. It will be understood that so long as the ribbon field changing mechanism is set as described with the field changing member or rocking frame 91 operatively engaging the actuator 78, each actuation of the ribbon vibrating mechanism will operate to present the upper printing field a, which is ordinarily-colored black or blue, to the types the path of their impression following a straight line longitudinally of the field a.

Suppose it be desired to print from the lower printing field b, which field is usually colored red, the operator swings the fieldchanging key 117 leftward, turning the rock shaft 116 in clockwise-direction, the turning movement of the rock shaft being limited by the engagement of the stop face 133 on the projection 134 with the stop face 131 on the swinging or pivoted stop member 123. This stop member 123 will be maintained in proper position to arrest the rock shaftby reason of the engagement of the stop face 128 with the curved face of the triangular projection 134, which curved face as it is turned will not affect the location-of the stop face 131. The latter will remain substantially stationary through such turning movement and'also when the face 133 engages with it to arrest the rock shaft. The turning movement of the rock shaft 116 will be transmitted to the crank arm 115, which will act on the pivoted arm 98 to swing and slide it from right to left, disengaging the detent notch 109 from the spring detent a'rm 111 and causing the'notch 110 to engage with said spring arm to center or maintain the parts in their newly adjusted positions. The leftward motion of the .arm 98 will be transmitted through the notch or slot 107 to the finger or extension 93 of the rocking frame 91, which frame will be slid leftward along the shafts or rods 76 and 90 from the position illustrated in Figs, 2 and 5 to the position illustrated in Fig. 4. From the latter figure it will be observed that sliding movement of the rocking frame has brought the slotted portion 96 intoposition where it surrounds the actuator 78, which may swing idly in the slot 96 during subsequent vibrations. At the same time the slotted portion 95 of the rocking frame has been carried leftward past the actuator 73 which will now be engaged by the narrow or operating slotway 97. As a result, if now one of the printing keys be operated, resulting in the actuation or swinging forward of the rock ing frame 91' as has been described, the movement of said rocking frame will now be transmitted .to the actuator 73, causing it thrOugh,itS forked end 72 to act on the pin '70, turning the crank arm 67 and the rock shaft 62, which will act to swing the lever 1 arm 59 upward and lift the vibrator 43. It

will be observed that not only is the arm 73 longer than the arm 78 but the pin 70 is nearer the center of motion of the shaft 62 than is the pin 71. As a result, the motion transmitted to the lever arm 59 and vibrator 43, will be considerably greater than in the first instance, and when the rocking frame is arrested by engagement of the stop 93 with the finger 63*, the vibrator Will have been lifted far enough to present the ribbon field Z) to the printing types, which types as long as the parts remain adjusted as described will follow a straight path longitudinally of said ribbon field b. To restore the ribbon field changing mechanism so as to print from the upper ribbon field a, it is only necessary to turn the finger piece or key 117 rightward effecting a return rotary movement of the rock shaft, which will conposition substantially to the Fig. 13 posi tion, carrying the stop face 129 from the path of the stop face 132 and leaving the rock shaft 116 free to be rotated leftward or counter-clockwise by an operation of the handle or key 117 The leftward turning of the rock shaft will be limited by the engage ment of the stop face 132 with the lefthand side wall of the slot 127, as in Fig. 13. When the operator releases the key 126 the stop member 123 will be maintained in its lifted, or Fig. 13, position, by reason of the engagement of the stop face 130 with the curved upper surface or face of the projection 134. As a result of this leftward turning of the rock shaft 116, the crank arm 115, acting on the arm 98, will swing said arm rightward until the detent notch 108 engages with the detent arm 111. The rightward movement of the arm 98 will be transmitted through the projection 93 to the rocking frame or field changing member 91, which will be slid rightward along its supporting and guiding rods 7 6 and 90 from. the Fig. 5 to the Fig. 6'position. Due to this movement the slot portion 95 will be brought opposite both actuators 73 and 78, this slot 95 being of such width that during the swinging movements of the rocking frame due to the operation of the printing keys,

'the rear wall of said slot will not engage with either actuator, which consequently will not be affected or operated, although the rocking frame will be actuated during the printing operations. This will be apparent from a consideration of Figs. 6 and 10 which illustrates the operated position of the parts when the field changer is set for stenciling work. It will be observed that the throw of the rocking frame is constant or unvarying under the actuation of the printing key levers but that by reason of the variable adjustment of the field changing member 91 said rocking frame variably actuates the ribbon vibrator, throwing it far enough to bring one ribbon field or the other at will opposite the printing point; and

. also that when set in another position the constant movement of the member or rocking frame under the actuation of printing keys is ineffective to move the ribbon vibrator at all.

Various changes may be made without departing from my invention.

IVhat I claim as new and desire to secure by Letters Patent, is-

1. In a typewriting machine, the combination with a ribbon vibrator, of means for variably actuating said vibrator, said means comprisng a crank arm, two actuators, each constantly engaging with said crank arm, a rock shaft on which said crank arm is mounted, a lever arm carriedby said rock shaft, and a ribbon vibrator connected to said lever arm, and a detachable member on which said crank arm, actuators, rock shaft, lever arm and vibrator are supported.

2. In a typewriting machine, the combination of a ribbon vibrator, a lever arm connected thereto, a rock shaft to one end of which said lever arm is secured, depending hanger arms supporting said rock shaft, a crank arm fixed to and depending from said rock shaft, lateral pins projecting oppositely from the said crank arm at different distances from its axis of rotation, pivoted arms each having a portion loosely engaging one of said pins, a slidable rocking frame having a slotted portion co-operating in alternation with said pivoted arms, and astop on one of said hanger arms for limiting rocking movements of said rocking frame.

3. In a front strike typewriting machine, the combination of a vertically arranged ribbon vibrator; and means for variably actuating said vibrator comprising a horizontally arranged rock shaft extending from the middle of the machine towards one side thereof, a horizontally arranged lever arm carried by said rock shaft near one end and pivotally connected with said vibrator, a crank arm fixed to said rock shaft near its right-hand end and extending downward therefrom, oppositely extending projections on said crank arm, and two actuators each having a hooked end constantly engaging with one of said projections.

4. In a typewriting machine, the combination with a ribbon vibrator, of means for variably actuating said vibrator, said means comprising two actuators constantly connected to said vibrator, a rocking frame settable to actuate said actuators at will, a rock shaft on which said rockin frame is slid ably supported, and a swinging rod also assisting to support and guide said rocking frame. I

5. In a typewriting machine, the combination with a ribbon vibrator, of means for variably actuating said vibrator, said means comprising two actuators constantly connected to said vibrator, a rocking frame settable to actuate said actuators at will, a rock shaft on which said rocking frame is slidably supported, a rod also assisting to sup port and guide said rocking frame, and. means for swinging said rod to vibrate said frame.

6. In a typewriting machine, the combination of a ribbon vibrator, a lever arm connected thereto, a rock shaft to one end of which said lever arm is secured, hanger arms depending from a stationary part and supporting said rock shaft, a crank arm fixed to and depending from said rock shaft, lateral pins projecting oppositely from the said crank arm at different distances from its axis of rotation, pivoted arms each having a hooked end engaging one of said pins, a slidable rocking frame having a slotted portion cooperating in alternation with, said pivoted arms, and means for actuating said rocking frame at printing operation comprising a swingin rod which assists also to support and guide said rocking frame.

7. In a typewriting machine, the combination with a ribbon vibrator, two actuators operatively connected to said vibrator, a rocking frame settable to actuate said actuators at will, a rock shaft on which said rocking frame is slidably supported, crank arms fixed to said rock shaft, and a rod carried by said crankarms and passing through slotways in the sides of said rocking frame.

8. In a typewriting machine, the combination with a ribbon vibrator, two actuators operatively connected to said vibrator, a rocking frame settable to actuate said actuators at will, a rock shaft on which said rocking frame is slidably supported, crank arms fixed to said rock shaft, a rod carried by said crank arms and passing through slotways in the sides of said rocking frame, and a key operated universal bar connected to said rod.

9. In a typewriting machine, the combina tion with a ribbon vibrator, two actuators operatively connected to said vibnator, a rocking frame settable to actuate said actuators at will, a rock shaft onv which said rocking frame is slidably supported, crank arms fixed to said rock shaft, and a rod carried by said crank arms and passing through slotways in the sides of said rocking frame, said frame being settable so that when rocked it will swing clear of said actuators.

10. In a typewriting machine, the combination with a ribbon vibrator, two actuators operatively connected to said vibrator, a rocking frame settable to actuate either of said actuators at will, a rock shaft on which said rocking frame is slidably supported, a rod carried by said rock shaft and passing through slotways in the sides of said rocking frame, means for actuating said rod comprising a downwardly extending crank arm fixed to said rock shaft, a universal bar frame, and an upwardly extending crank arm rigid with said universal bar frame and having a pin and slot connection with said downwardly extending crank arm.

11. In 'a typewriting machine, the combination of a ribbon vibrator; two actuators for variably actuating said vibrator; a settable device having an unvarying throw for operating said actuators in alternation; and means for setting said device comprising a rock shaft, a crank arm fixed to said rock shaft, an arm pivotally connected to said crank arm and slotted to co-operate with a projection on said settable device, and a nger piece fixed to said rock shaft.

12. In a typewriting machine, the combination of a ribbon vibrator; two actuators for variably actuating said vibrator; a settable device having an unvarying throw for operating said actuators in alternation; and means for setting said device comprising a rock shaft, a crank arm fixed to said rock shaft, an arm pivotally connected to said crank arm and slotted to co-operate with a projection on said settable device, and a finger piece fixed to said rock shaft, said settable device also being adjustable by said finger piece so that when rocked it will swing clear of both actuators.

13. In a typewriting machine, the combination of a ribbon vibrator; two actuators for variably actuating said vibrator; a set-r table device having an unvarying throw for operating said actuators in alternation; and means for setting said settable device comprising a rock shaft, a crank arm fixed to said rock shaft, a slidably mounted member pivotally connected with said crank arm and having a slot engaged by an extension on said settable device, detent devices cooperative with depressions or notches in said member; and a finger piece or key connected to said rock shaft. n i

14. In a typewriting machine, the combination of a ribbon vibrator; two actuators for variably actuating said vibrator; a settable device having an unvarying throw for operating said actuators in alternation; and means for setting said settable device comprising a rock shaft, a crank arm fixed to one end of said rock shaft, a slidably mounted member pivotally connected with said crank arm and having a slot engaged by an extension on said settable device, detent devices co-operatix e with depressions or notches in said member; a finger piece or key connected to said rock shaft; and indicating devices comprising a pointer fixed to said rock shaft and a stationary indicator secured to the frame of the machine.

15. In a typewriting machine, the combination of a ribbon vibrator; two actuators for variably actuating said vibrator; a

settable device having an unvarying throw for operating said actuators in alternation;

and means for setting said settable. device comprising a rock shaft, a crank arm fixed to one end of said rock shaft, an arm connecting said crank arm with said settable device, detent devices co-operative with said arm, and a finger piece or key connected to said rock shaft; indicating devices comprising a pointer fixed to said rock shaft and a stationary indicator secured to. the frame of the machine; andstop devices for positively limiting turning movements in opposite directions of said rock shaft.

16. In a typewriting machine, the combination of a ribbon vibrator; two actuators for variably actuating said vibrator; a settable device having an unvarying throw for operating said actuators in alternation; and means for setting said settable device comprising a key set rock shaft, a crank arm fixed 'to said rock shaft, an arm connecting said crank arm with said settable device, and detent devices co-operative with said arm; and stop devices for positively limiting turning movement of said; rock; shaft, comprising a collar fixed to said rock shaft and provided with a triangular projection having stop faces and a co-operating stop member pivoted to the frame of the machine. 1

17. In a typewriting machine, the combination of a ribbon vibrator; ribbon field changing devices comprising a key set rock shaft, stopdevices for positively limiting turning movement of said ro k shaft comprising a collar fixed to said rock shaft and provided with three stop faces, and a oo-operating swinging stop provided with a series of stop faces, certain of said stop faces 00- operating with said collar to limit movements of said rock shaft when the field fit changer is being set to bring the upper and lower printing fields into use and certain other of said stop faces co-operating with said collar to limit the movement of said rock shaft when the field changing device is being set to render it ineffective on the ribbon vibrating mechanism.

18. In a typewriting machine, the combination of a ribbon vibrator; means for variably actuating said vibrator comprising a settable field changing device; means for variably setting said device comprising a rock shaft; and stop devices co-operative with said-rock shaft said stop devices comprising a collar fixed to said rock shaft and provided with a triangular projection having stop faces, and a co-operating swinging stop provided with a series of stop faces, certain of said stop faces .co-operating with the triangular stop to limit movements of said rock shaft when the field changing device is being'set to bring the upper and lower printing fields into use and certain other of said stop faces co-operating with said triangular stop to limit the movement of said rock shaft when the field changing device is being set to render it ineffective on the ribbon vibrating mechanism.

19. In a typewriting machine, the combination of a ribbon vibrator; means for variably actuating said vibrator comprising a. settable device; means for variably setting said device comprising a rock shaft; and stop devices co-operative with said rock shaft, said stop devices comprising a collar fixed to said rock shaft and provided with a triangular projection having stop faces, and a pivoted frame stop provided with three stop faces co-operati've with said triangular stop to positively arrest said rock shaft in the upper ribbon field position, in the lower ribbon field position, and in the stencil or mimeograph position.

20. In a .typewriting machine, the comb-ination of a ribbon vibrator, means for actuating said vibrator comprising a. settable frame, setting means for said frame comprising a rock shaft, and stop devices comprising a key controlled frame stop for positively arresting said rock shaft in three predetermined positions.

21. In a. typewriting machine, the combination of a ribbon vibrator, means for actuating said vibrator comprising a settable frame, setting means for said frame comprising a rock shaft, stop devices comprising a pivoted frame stop for positively limiting turning movements of said rock shaft in both directions, said rock shaft being thus arrested in two predetermined positions, said frame stop being movable to a position where it is effective positively to arrest said rock shaft in a third predetermined" position.

Signed at the borough of Manhattan, city of New York, in the county of New York and State of New York, this 17th day of August, A. D. 1920. JOHN H. BAR-R. Witnesses:

' CHARLES E. SMITH,

E. M. VVELLs. 

